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Based on my history with my 09 x3 oil change inspection counter, that sounds about right. If my memory is right that counts down based off of liters of fuel consumed so on the bright side it's had good gas consumption .

What those records don't reflect is if oil was changed more frequently. Most of us replace half way through our milage counter. I would highly suggest getting a PPI done at a trusted Indy mechanic.

Can't speak to diesels -- they may be different in terms of service intervals for oil service. I would hope they are, as a diesel running over 25K miles between changes is too long IMHO. You may have a car that was maintained personally for oil changes, and so not documented, or one that just didn't get the service. We do have some folks who run the X3 diesel down in Oz, South Africa, UK, and South America who would be able to give you a good answer. For my '06 X3 gasser the service intervals were 15K, 30K, 45, and 60K etc. As X3Brian mentions most here also change oil between those intervals, around 7500 or so.

Official dealer book stamps are at 25k and at 59k and at 75k with inspection 1 done at 59k.

Does this sound like a VERY long interval, or not unheard of?

Those are kms. not miles being Estonia?

Looks like the standard BMW recommended oil changes, although the 2nd. one was quite late.

The Inspection I at 59K kms. was about 9K kms. late too.

Better to look for one where the original owner has gone with shorter oil change intervals.

I don't think being a diesel makes much difference.
Oils have been developed to meet the high mileage demands of diesel fleet operators more so than they have been for individual owners of gasoline vehicles.